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Comedian Bill Cosby filed a breach of contract lawsuit against his accuser in his sex assault case. The lawsuit also names the woman's mother, her lawyer and the National Enquirer. (Published Wednesday, Feb. 17, 2016)

Bill Cosby has filed a breach-of-contract lawsuit against a woman whose 2005 sexual-assault accusation led to his recent arrest.

The lawsuit, filed a day before a key hearing in the criminal case against Cosby, names accuser Andrea Constand, her lawyer, her mother and the publisher of the National Enquirer.

The lawsuit remained under seal Wednesday, and Cosby's lawyers declined to comment on the nature of the allegations in it.

However, the defendants were all subject to confidentiality clauses that covered the settlement of lawsuits that Constand filed against Cosby and the tabloid, published by Boca Raton, Florida-based American Media Inc., in 2005.

Constand accused Cosby of drugging and molesting her at his suburban Philadelphia home in 2004.

Her complaint wasn't prosecuted at the time, but new prosecutors reopened it last year and arrested Cosby in December, just before the 12-year statute of limitations expired. As part of their investigation, they interviewed Constand and her mother and obtained files from her lawyer.

Dozens of other women in recent years have come forward and accused Cosby of sexual impropriety spanning decades. Cosby, who played Dr. Cliff Huxtable on "The Cosby Show" from 1984 to 1992 and has been married for decades, has denied the women's accusations. The statute of limitations has expired in most of the cases against him.

Cosby filed the breach-of-contract lawsuit against Constand a day before a Feb. 2 criminal court hearing that included testimony from her lawyer, Dolores Troiani. Troiani mentioned at the hearing that Cosby had sued her but did not elaborate.

The judge warned Cosby's lawyers not to accuse Troiani of breaking the confidentiality agreement through her testimony because she had received a subpoena to testify about her involvement in the case.

Cosby sought the hearing to explore whether he had a promise from the prior district attorney that he would never be charged over the encounter with Constand, who was then a basketball team employee at Temple University, his alma mater. The judge rejected his bid to have the criminal case dismissed.